A cobpobation op new jbbfiby



, Filed Dqc. 15, 192:5

G. W. LAUTRUP BRAKE 2 Sheets-Sheet 1 Dec. 2z, 192s. 1,556,485

G. W. LAUTRUP BRAKE Filed Dec. l5, 1923 2 Sheets-Sheet 2 han@ De.. 22, i925.

UNITED STATES PATENT oFEicE.

GIORGI W. LAUTBUP, F NEW YORK, ASIIGOB TO OTIB ELEVLTUB 00x- 2m, 0l' um GITY, HRW JERSEY, A OORPORATION 0l NEW um.

appumien inea mmmia, iosa. semi so. 680,947.

To whom t may concern:

Be it known that I, Gnoiion W. Lau'rnur, a

Yonke l -in the county of Westchester and State of ew York, have invented a new and useful Improvement in Brakes, of which the following isa specification. 4.

M invention relates to brakes of the type `n which a plurality of shoes are applic to a brake drum by one setof forces end released by'an opposing force. More particularl y fmy invention relates to multiple shoe br for elevator hoisting machines in which the brake is a plied by 'sprin or gravit.;v and released e ectroma etical y.

Une object of my invention is to equalize stall times, when the brake is applied, the ressure of-the various shoes on the brake rum regardless of the adjustment of the applying means, and in the event of the failure of .one of the applyingmeans, to aplly the remaining applying means` equa 1y throgh the various shoes.

Further objects of my invention areV to vide a-brake in which the kinetic energy imparted to the moving parts in the operation of the brake is small, in which lost modescribed in connection with the tion is minimized and in which the fixed supports for the moving parts are kept as low las ossible in the interest of mechanical strength), lightness and economy of space.

'In the improved brakin mechanism, I employ the principle of mec anically applyin and magnetically releasing a lura ity of king units which interact to istribute the applying and releasing forces. I also prefer to provide a .plumfllty of mechanical actuators, each applied to all of the braking yinsite" but capable of operation alone upon failure of the others.

One embodiment of my invention will be accompanyin drawings, in whichigure 1 isa diagrammatic view'showing the principles of construction of my brake.

Figure 2 jis a side elevation. of an electromagnetically released, spring. applied brake embodying my invention, with parts cutaway showin other parts in section. Figure 3 is a pl an viewof the brake shown "in Figure 2.

4 throughout the several views.

Similar numerals refer to similar parte embodiment illustrated comprises f two braking units similar in construction 4ing spring 22 secured b and sgmmetrically a bra e drum.

Referring to Fi arranged with respect to re 1, brake arm 4 is pivotally support on pin 5 in lug 2, which projects upwardly from base 1. Brake 60 shoe 6 is pivotally secured to arm 4 by pin 7. Brake arm 4 extends across the top of brake drum 34 and at its upper end is brake magnet housin 8, which is provided with a core 9 and coil 10. In a similar manner 65 brake magnet housing 11, core 12, coil 13,

.and brake shoe 16, with its pivot 17, are

'arm 4 an is pivotally Vconnected to'brake magnet housing 11 b pin 29. A stop 30 is adjustablyinoun in the lower end of brake arm 4 and' is held in place by nut 3l. Likewise a stop 32 secured by nut 33 is provided .in the ower end of brake a-rmi14. The brake shoes are adapted to engageathe brake drum 34 when the brakeis applied, 55 this brake drum being secured to shaft 35 as b key 36. Current is su lied togfthe two rake magnet coils throu leads lnd 38. These brake magnet coi s may be eennected vin series as shown or in parallel if desired.

When the coils of the brake magnet are energized, the cores 9 and 12 are attracted. The 'usigs ,8 and 11 move toward each other and, since they are transposed, a reversal of motion between these housings and the brake shoes 6 and 16 is brought about so that brake shoes 6 and 16 move apart. If the cores 9 and 12 with housin 8 and 11 move at the same time when the rake Gbils adjusting nuts 75 A Ajustedtothe same 'sures'brake shoes p drum is secured.

,shoes 6 and 1 to .but inde endently of ssgingdwt Thus,

no metter w other springs 24ore' ad. pressure or dierentresand' 16 will always ar y o'nbrake .drum845 with s, pressure equa o0 ndmgto the sum ofthe 'pressures of the two springs. This equalization of pressure of the brakevshoes o'n. the drum is of advantage in that it distributes the .wear esnelly among the brake shoes and tprevents si e pressure on the shaft to which e brake Due to the small number in my broke; the lost motionin the moving small. motion an parts-ensures anun-unum of alammin o 'deseribedin connection wi A'will be described together.

vparte is very small. Consequently, I am able to use a air gap between the cores, andthis rmits of the coils and cores beingsmall an of lightweight. The resulting low inertia of the movin the' cores when the brake is 'release a smooth 'application of th'e shoes when the brake is applied,- -and quick action in'both and a plying. Figures 2 an 8 show details of construe# tion of a brake .Base I carries lugs-2 and. Brake arm 4 is' pivotallyniounted on pinV 5 in lug 2. .-Brake'shoe 6vis adPlod to :7. in block 89, the letterv 106688 being moun in 42. To kee the brake shoe concentric with the drum w en the brake is released,'so that :1110 part of the brake shoe will drag and reeiliently vyielding abutmenton the brake arm for the brake shoe.- Between this abutment andthe pivoted point of the-brake ment and for maintaining tween the'parts-of the pivotal mounting the brake shoe, which pressure este. in ,thel

'the' brake is applied.

o nuts 56 on rod tion the brake shoe 6l and the brake v shoefI provide resilient means for holding the brake shoe in engage a pressure bei,

same direction as the pressurerexe'rted when Thus-1n the case ci brake shoe 6, `a rodis mildly in shoeand dsthro mq Min brake arm 4. 66 over rod 8 with forms a resilient connec- 'meow oes Afrom the is ensured vwheneverthe brake equal` spring plivotal mounting. Breite shoe lois ofpivot point@ bypin 19 an -exte -Veompression collar 63 -an the principles, .Figure 1, and

pivot 'about in 40 in brake arm 4 'forfsdjustme'nt in a direction-perpendicular to th'e axis of the brake drum lay-means of screw 41 sndnut vent lost motion between therhrake .shoe an brake arm, I provide en adjustable.'

nient with the ebutlullin!! tending to ull-the lower brake shoe away' rom the. drum 84. An

pertofthe other 57 with its spring 641 lextends opening 58 and recess 69 in .=brake through arm and serves as anfebutmenn for luV 60 onbrake shoe 6. Nuts 62 onrod 574 hol -t'he rod a inst the pressure of spring 61 and are adjV to vary the :compression of the 'It will be noted that rods 53 and 57 are so located with respect to pivot in 7 v"that the pressure :exerted by spring es mi 57 serving as pressureon the pivot'7 when lthe brake Ais rphed ls'also outward from the-'shaft 35,4

' 6 va'ots -to push the' brake shoe 6, pin-7 and block'Q" s youtwardly from. shaft an abutmentfor the braheshoe.-v Since thee; brake shoe 6 land brake arm 4' will main in the samejrelative 'positions Ela-l1 times` irrespective of lost motion in '4 `Corellis secured within-the f i surrounds core 9 and isastened to'ho t.

81as by'screws 43. Similarly core`12' en od'18 is ivotaillc?Y connected to. core 9'- ousing. 11 Adjusting nuts 28 an col` fwn 1 3 me bled in brake magnet vheus-- iii-11', which forms partei brake arm 141'.

through'openi' w20 1n- .oe ne provided-et thema of we 1s and 22 is interposed between brake magnethousing' 11". Likewise. rod .26,ha1lig adjusting nuts 25 and Acollar 64, isnivo yottach 29 to core 12 an extends throng 'ope 27 in housing 8.'. Spring 24 surrounds 26 between collar Mfand housing'e will be observed that each ofthe 'actuator 22 and 24 aetsindependently to amp both brakel 8110631311 brake with a rossore corresponding to its strength' The to 1 pressure, therefore, with which the pressures devolo 24 and transmitted -and 14.

'los

ybrake shoes are'ap 1 ied,is-the"sum ofthe lag-both sirings 22nd t rough` rake "arms-4*- e pressure with 'which the-larghe tween the brake shoes."A

l z Bieke am un provides@ niwedd "M with a ent stop consisting oi pin 30'- ien g through opening 48. in hrakearm-L uts 1 it of` adj the pin 80'- with respect to boss similar stop is. i brake arm 4. .When one of the brake arms other, its sto arrests its movement etfthe limit to whic it is adjusted endthereafter edaiitd 'r movement in reeess and'ex-l 49 surrounds pm '80 in recess 65.'

tionofprovided at un im. me of vluis released its brake 'shoe ahead ofthe the full force of the magnet thus applied to the movement of the other ariii.

The o rationof the brake is similar to that out ined in connection with the dia matic view in Figure 1. Whenthe rake magnet coils are ener 'zed, cores 9 and12 are attracted and re ative motion between the brake arms 4' and 14 follows. Both arms may move at the same time to release motion.

brake shoes 6 and 16 or one may move until its resilientstop engaes its corresponding boss, whereupon the ot er arm moves. This results in the releasing of both shoes clear Y off'the brake drum, by the time cores 9 and 12' come together.

I desire to have the lower ends of the brake arms pivotally sup orted close to the baseplate and to a ply t e actuating forces to their upper en s, while sup rtingthe brake shoes on pivots at points etween the upper and lower ends of the arms. By this arrangement the brakefarms act as levers of the second order'in both the application and release ofthe brake shoes. By crossing the upper ends of the brake arms, I am enabled to utilize the construction desired and at the same time rigidly attach the ma et cores to the u per ends of the arms an obtain the releasing of the brake shoes as the magnet cores move toward each other. By this -construction I minimize the 'number of joints, which are always subject to wear and lost Furthermore, by the resilient of the brake shoes on the brake iminate lost motion at these points.,

, ints at which lost motion can mountin arms, I e

' occur are-t e pivots 5 and 15, which may be made of liberal dimensions to d the wear. The small amount of lost motion makes possible a very small movement of the parte of the brake to free the shoes from the rake This small movement in turn, permits of releasing and applying the brake 'quickly without imparting any great amount of kinetic energy to its moving parts. The

result of this is smooth action without slammin Furthermore, since the pressureon the rake drum is at all times equally di 4,combination a rakedruin, a air of brake arms each pivotally supporte at one end and crossin the Vother at its other end, brake shoes suita ly supported at intermediate portions of said arms, to be applied to said rake drum, mechanical. actuators interconnectingthe free ends of said arms and each ake drum-is mounted is not subapplied, A

constantly tending to move the brake shoes into contact with said brake drum regardless of the other, and electromagnetic actuating means for drawing'the crossed free ends of said arms toward each other against the force of said mechanical actuators, to release said brake shoes from said brake drum.

3. A magnetically released, mechanically applied braking mechanism comprising in combination a pair of pivotal] supported brake arms, brake shoes carrie thereby, a brake drum to which said shoes may be applied, yielding mechanical actuat' means tending to apply said shoes to drum and a ma et coil and core on the free end of each .o said arms, those of one arm being magnetically related to those of the other for mutual attraction and transposed to cause the portions of the arm carrying the lease the brake shoes. l In testimony whereof, I have signed my name to this specification.

GEORGE WLAUTRUP.

n shoes to move away from each other and re occur arey memes 3 the full force of the magnet is thus applied to the movement of the other arm.

The o ration of the brake is similar to that outlined in connection with the dia m' matic view in Figure 1. When the rake magnet coils are ener `zed, cores 9' and 12' are attracted and re ative motion between the brake arms 4' and 14 follows. Both arms may move at the same time to release brake shoes 6 and 16 or one may move until its resilient-stop enga es its corresponding boss, whereupon the ot er arm moves. This results in the releasing of both shoes clear of the brake drum, by the time cores 9 and 12' come together.

I desire to have the lower ends of the brake arms pivotally supported close to the base plate and to apply the actuating forces to their upper ends, while supportingthe brake shoes on pivots at points between the upper and lower ends of the arms, By this arrangement the brakarms act as levers of the second order-in both the application and release ofthe brake shoes. By crossing the upper ends of the brake arms, I am enabled to utilize the construction desired and at the same time rigidly attach the ma et cores to the upper ends of the arms an obtain the releasing of the brake shoes as the magnet cores move toward each other. By this-construction I minimize the 'number of joints, which are always subject to wear and lost motion. Furthermore, by the resilient mounting of the brake shoes on the brake arms, I eliminate lost motion at these points. The only ints at which lost motion can tlig pivots 5 and 15, which may be made of liberal dimensions to decrease the wear. The small amount of lost motion makes possible a very small movement of the parts of the brake to free the shoes from the brake drum. This small movement in turn, permits of releasing and applying the brake quickly without imparting any great amount of kinetic energy to its moving parts. The result of this is smooth action without slammin Furthermore, since the pressure on the Iirake drum is at all times equally divided among the various shoes, the brake shoe lining? wear equally and the shaft on which the rake drum-is mounted is not subjected to side thrusts.

I claim:

1. Braking mechanism comprising in mbination a brake drum, a pair of brake arms, a brake shoe carried b each arm between its ends to cooperate wi said brake drum, a pivotal support for each arm at one end and afmagnet coil and core rigidly mounted on the other end of each arm for drawing them toward each other and releasing said shoes from said drum.

2. A mechanically applied, magnetically.

released braking mechanism, comprising 1n combination a brake drum, a pair of brake arms each pivotally supported at one end and crossm the other at its other end, brake shoes suita 1y supported at intermediate portions of said arms, to be applied to said rake drum, mechanical actuators interconnectmg the free ends of said arms and each constantly tending to move the brake shoes into contact with said brake drum regardless of the other, and electromagnetic actuating means for drawing the crossed free ends of said arms toward each other against the force of said mechanical actuators, to release said brake shoes from said brake drum.

3. A magnetically released, mechanically applied braking mechanism comprising in combination a pair of pivotall supported brake arms, brake shoes carrie thereby, a brake drum to which said shoes may be applied, yielding mechanical actuatin means tending to apply said shoes to sai drum and a m et coil and core on the ree end of each o said arms, those of one arm being magnetically related to those of the other for mutual attraction and transposed to cause the portions of the arm carrying the shoes to move away from each other and rej lease the brake shoes.

In testimony whereof, I have signed my name to this specification.

GEORGE W. LAUTRUP.

cmiaemof camasn isimaisediha in A'Leiters iraient; No, mnwember 19,25, upon:

nliersjNew York, for? an im vement inl f rakesA-errorsgappearin the:I rinted "speci'cation 'req'uiriir corrrle'ftion as follows: 'Page 3, line {'60,} claim l, strilrepiit the word them 7 an insert said other endsi'lsame 4 age; line 90, 'hu v4E, for the word arm r read oms; and lthatV the said am' aientshould be read with these corrections therein that the same may conform to the record ofthe vcase in the Patent Oilce.

Signed and sealed this 9thA day of March,.1A.fD. 1926.

[mL-l Certioate of Correction.

It is heraby rtied that in Letters 4Patent No, l,566 Dooember`.2g 1926, upontge application of George W. LgutrupQo onliers, New York, foran' improvement in Brakesff'errors appear in the printed specification 'requirin correction as follows: Pago 3, lne 60, claim 1, stmk@ out the word thm an nse`1-t-nstead-said other erlds; same age, line 90, claim 3, for the word arm road am; and that the saxd Letters stent should be read with these corrections therein. that the same may conform to the record of the case in the Patent (mice.

Signed and sealed this 9th day of March, A. D, 1926. M

[BILL] M1. MOORE,

wing `of Pa'tenm; 

